Relay Communication System and Access Management Apparatus

1. A relay communication system comprising: a first relay apparatus provided in a first LAN; a second relay apparatus provided in a second LAN; and an access management apparatus defined by a third relay apparatus provided in a third LAN and configured to hold an access permission list in which identification information of access target apparatuses and identification information of apparatuses permitted to access the access target apparatuses are associated with each other; wherein the first relay apparatus is configured to request, to the access management apparatus, a selection list of apparatuses accessible by the first relay apparatus, select the second relay apparatus from the selection list, and transmit to the access management apparatus an access request to the second relay apparatus; the second relay apparatus is configured to be in an initial state of denying access from apparatuses other than the access management apparatus, and change to a standby state for connection to the first relay apparatus when having received an access permission request from the access management apparatus; the access management apparatus includes: an access permission unit configured to extract, from the access permission list, information corresponding to the first relay apparatus, create the selection list, and transmit the selection list to the first relay apparatus, and when having received from the first relay apparatus an access request to the second relay apparatus, determine whether or not to permit the first relay apparatus to access the second relay apparatus based on the access permission list; a notification unit configured to, in a case where the first relay apparatus is permitted to access the second relay apparatus, notify the second relay apparatus of the access permission request, and notify the first relay apparatus of an access permission to the second relay apparatus; and an access recording unit configured to record a status of access from the first relay server to the second relay server as an access record information, update the access record information based on a session establishment notice from the first relay server including an update time, and update the access record information based on a session disconnection notice from the first relay server including a receipt time; the first relay apparatus includes: a communication session establishment unit configured to establish a communication session with the second relay apparatus when having received the access permission, and an access status notification unit configured to notify the access management apparatus of the session establishment notice and the session disconnection notice; each of the first relay apparatus and the second relay apparatus includes a relay communication unit configured to relay, by using the communication session, communication between a first communication terminal connected to the first LAN on the first relay apparatus side and a second communication terminal connected to the second LAN on the second relay apparatus side; and the first, second, and third LANs are separate and different LANs.

2. The relay communication system according to claim 1 , wherein the access management apparatus further includes a list transmission unit configured to transmit the selection list to the first relay apparatus, and the first relay apparatus further includes a selection unit configured to select the second relay apparatus as an access request destination by using the selection list.

3. The relay communication system according to claim 1 , wherein each of the first relay apparatus, the second relay apparatus and the access management apparatus further includes a relay server information sharing unit configured to share among each other a relay server information, the relay server information includes activation information of the first relay apparatus and the second relay apparatus, and activation/registration information of client terminals connected to the first relay apparatus and client terminals connected to the second relay apparatus.

4. The relay communication system according to claim 3 , wherein the first relay apparatus further includes a display unit configured to display the relay server information.

5. The relay communication system according to claim 1 , wherein the communication session is a routing session that serves as a media session that performs routing control for a communication packet transferred between the first relay apparatus and the second relay apparatus.

6. The relay communication system according to 5 , wherein, in the routing session, the first relay apparatus and the second relay apparatus exchange network addresses with each other after the routing session is established.

7. The relay communication system according to claim 6 , wherein, in exchanging the network addresses, the first relay apparatus and the second relay apparatus respectively permit accesses to all terminals connected to the respective LANs to which the first relay apparatus and the second relay apparatus are connected.

8. The relay communication system according to claim 6 , wherein, in exchanging the network addresses, the first relay apparatus or the second relay apparatus respectively permit accesses to a portion of terminals connected to the respective LANs to which the first relay apparatus and the second relay apparatus are connected.

9. An access management apparatus capable of performing communication with a first relay apparatus provided in a first LAN and a second relay apparatus provided in a second LAN, comprising: a list transmission unit configured to hold an access permission list in which identification information of access target apparatuses and identification information of apparatuses permitted to access the access target apparatuses are associated with each other, extract, from the access permission list, information corresponding to the first relay apparatus, create a selection list of apparatuses accessible by the first relay apparatus, and transmit the selection list to the first relay apparatus; an access permission unit configured to, when having received from the first relay apparatus an access request to the second relay apparatus, determine whether or not to permit the first relay apparatus to access the second relay apparatus based on the access permission list; a notification unit configured to, in a case where the first relay apparatus is permitted to access the second relay apparatus, notify the second relay apparatus of an access from the first relay apparatus, and notify the first relay apparatus of an access permission to the second relay apparatus; and an access recording unit configured to record a status of access from the first relay server to the second relay server as an access record information, update the access record information based on a session establishment notice from the first relay server including an update time, and update the access record information based on a session disconnection notice from the first relay server including a receipt time; wherein the access management apparatus is defined by a third relay apparatus provided in a third LAN; and the first, second, and third LANs are separate and different LANs.

10. A relay communication system comprising: a first relay apparatus provided in a first LAN; a second relay apparatus provided in a second LAN; and an access management apparatus defined by a third relay apparatus provided in a third LAN; wherein the access management apparatus includes: an access permission unit configured to hold an access permission list in which identification information of access target apparatuses and identification information of apparatuses permitted to access the access target apparatuses are associated with each other, extract, from the access permission list, information corresponding to the first relay apparatus, create a selection list of apparatuses accessible by the first relay apparatus, transmit the selection list to the first relay apparatus, and, when having received from the first relay apparatus an access request to the second relay apparatus, determine whether or not to permit the first relay apparatus to access the second relay apparatus based on the access permission list; a notification unit configured to, in a case where the first relay apparatus is permitted to access the second relay apparatus, notify the second relay apparatus of an access from the first relay apparatus, and notify the first relay apparatus of an access permission to the second relay apparatus; and a session information acquisition unit configured to acquire, from the first relay apparatus, a session information regarding a communication session established between the first relay apparatus and the second relay apparatus based on the access permission; the first relay apparatus is configured to request the access management apparatus to transmit the selection list and includes a communication session establishment unit configured to establish the communication session with the second relay apparatus when having received the access permission; each of the first relay apparatus and the second relay apparatus includes: a relay communication unit configured to relay, by using the communication session, communication between a first communication terminal connected to the first LAN on the first relay apparatus side and a second communication terminal connected to the second LAN on the second relay apparatus side; the access management apparatus further includes: a disconnection instruction unit configured to, in a case where it has been determined that the communication session satisfies a predetermined condition based on the session information, transmit a disconnection instruction of the communication session to the first relay apparatus or the second relay apparatus; and an access recording unit configured to record a status of access from the first relay server to the second relay server as an access record information, update the access record information based on a session establishment notice from the first relay server including an update time, and update the access record information based on a session disconnection notice from the first relay server including a receipt time; and the first, second, and third LANs are separate and different LANs.

11. The relay communication system according to claim 10 , wherein the first relay apparatus further includes: an establishment notification unit configured to transmit the establishment notice of the communication session to the access management apparatus; and the disconnection instruction unit instructs the first relay apparatus to disconnect the communication session in a case where a time that has elapsed since the establishment notice was received reaches a predetermined time or more.

12. The relay communication system according to claim 10 , wherein each of the first relay apparatus, the second relay apparatus and the access management apparatus further includes a relay server information sharing unit configured to share among each other a relay server information, the relay server information includes activation information of the first relay apparatus and the second relay apparatus, and activation/registration information of client terminals connected to the first relay apparatus and client terminals connected to the second relay apparatus.

13. The relay communication system according to claim 12 , wherein the first relay apparatus further includes a display unit configured to display the relay server information.

14. The relay communication system according to claim 10 , wherein the communication session is a routing session that serves as a media session that performs routing control for a communication packet transferred between the first relay apparatus and the second relay apparatus.

15. The relay communication system according to claim 14 , wherein, in the routing session, the first relay apparatus and the second relay apparatus exchange network addresses with each other after the routing session is established.

16. The relay communication system according to claim 15 , wherein, in exchanging the network addresses, the first relay apparatus and the second relay apparatus respectively permit accesses to all terminals connected to the respective LANs to which the first relay apparatus and the second relay apparatus are connected.

17. The relay communication system according to claim 15 , wherein, in exchanging the network addresses, the first relay apparatus or the second relay apparatus respectively permit accesses to a portion of terminals connected to the respective LANs to which the first relay apparatus and the second relay apparatus are connected.

18. An access management apparatus capable of performing communication with a first relay apparatus provided in a first LAN and a second relay apparatus provided in a second LAN, comprising: an access permission unit configured to hold an access permission list in which identification information of access target apparatuses and identification information of apparatuses permitted to access the access target apparatuses are associated with each other, extract, from the access permission list, information corresponding to the first relay apparatus, create a selection list of apparatuses accessible by the first relay apparatus, transmit the selection list to the first relay apparatus, and, when having received from the first relay apparatus an access request to the second relay apparatus, determine whether or not to permit the first relay apparatus to access the second relay apparatus based on the access permission list; a notification unit configured to, in a case where the first relay apparatus is permitted to access the second relay apparatus, notify the second relay apparatus of an access from the first relay apparatus, and notify the first relay apparatus of an access permission to the second relay apparatus; a session information acquisition unit configured to acquire, from the first relay apparatus, a session information regarding a communication session established between the first relay apparatus and the second relay apparatus based on the access permission; a disconnection instruction unit configured to, in a case where it has been determined that the communication session satisfies a predetermined condition based on the session information, transmit a disconnection instruction of the communication session to the first relay apparatus or the second relay apparatus; and an access recording unit configured to record a status of access from the first relay server to the second relay server as an access record information, update the access record information based on a session establishment notice from the first relay server including an update time, and update the access record information based on a session disconnection notice from the first relay server including a receipt time; wherein the access management apparatus is defined by a third relay apparatus provided in a third LAN; and the first, second, and third LANs are separate and different LANs.